I am not using the RSform but does it not have a option to specify that the value entered is PHP CODE that must be executed?

Trying checking out RSform FAQ

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in fact I had to add //<code> at the begining and //</code> at the end in the Default value of my hidden RS form pro.

So it works for title (basic field) but when I try to use a custom field (well, if email field is a custom field) i've got this error : Parse error: syntax error, unexpected '.' in /administrator/components/com_rsform/helpers/rsform.php(449) : eval()'d code on line 17

my code is exactly the same (with //<code> and //</code> this time) like FAQ : Retrieving the value of a custom field :

-- FLEXIcontent is Free but involves a big effort on our part.Like the our support? (for a bug-free FC, despite being huge extension) Like the features? Like the ongoing development and future commitment to FLEXIcontent?-- Add your voice to the FLEXIcontent JED listing with a 5-star review. Thanks!

-- FLEXIcontent is Free but involves a big effort on our part.Like the our support? (for a bug-free FC, despite being huge extension) Like the features? Like the ongoing development and future commitment to FLEXIcontent?-- Add your voice to the FLEXIcontent JED listing with a 5-star review. Thanks!

-- FLEXIcontent is Free but involves a big effort on our part.Like the our support? (for a bug-free FC, despite being huge extension) Like the features? Like the ongoing development and future commitment to FLEXIcontent?-- Add your voice to the FLEXIcontent JED listing with a 5-star review. Thanks!